AstraZeneca has amended its collaboration agreement with Ironwood Pharmaceuticals, Inc. (Ironwood) in China mainland for Linzess* (linaclotide), a first-in-class new treatment for patients with irritable bowel syndrome with constipation (IBS-C).

IBS-C is characterised by symptoms of abdominal pain and constipation, is a chronic and prevalent functional gastrointestinal disorder in China and there are currently few treatment options for this condition.

The amended agreement gives AstraZeneca sole responsibility for developing, manufacturing and commercialising Linzess in China mainland, China Hong Kong and China Macau. Ironwood will no longer be involved in the research and development or the commercialisation of Linzess; it will also transfer manufacturing responsibility to AstraZeneca.

The two companies first entered into a collaboration to co-develop and co-commercialise Linzess in 2012. Under the original collaboration agreement, AstraZeneca and Ironwood were jointly responsible for strategic oversight of the development and commercialisation of Linzess in China, while AstraZeneca had primary responsibility for local operational execution.

Linzess was approved by the National Medical Products Administration for adults with IBS-C in January 2019 in China, where it is expected to be launched in 2019.